<iframe frameborder="0" allowfullscreen="allowfullscreen" [src]="url" width="304" height="605" class="iframe-wrapper"
  style="transform-origin: 0px 0px; display: block;"></iframe>
<div class="qrcode-box">
  <div id="code" #qrcodedom>
  </div>
  <p>真机预览二维码</p>
</div>